Sonja T. Morgan, 46, was arrested by Southampton Village police after failing a field sobriety test. Photo: NCPD

Reality bites.

A cast member of the hit Bravo reality show “Real Housewives of New York City” was busted for DWI early Monday morning in Southampton Village.

Sonja Morgan, 46, failed to halt at a stop sign on First Neck Lane at 2:16 a.m. and was pulled over by a Southampton Village officer, according to cops. Sources said she had been partying on the East End over the course of the Memorial Day weekend.

After failing a series of field sobriety tests, the ex-wife of J.P. Morgan’s great-grandson John Adams Morgan refused to take a Breathalyzer test and was taken to local police headquarters and slapped with a DWI rap, according to cops.

Morgan, who is in her first season on the show, will appear in court to face the charge at a later date.

The Post reported in May that a film company sued Morgan for reneging on an agreement to finance a flick after she was served with divorce papers.